Cahya, Meiliana, 		Prafitasari, Aulya, 		Somad, Mohamad, AND 		Usman, Ali.
" Improving Mutual Cooperation and Students' Cognitive Learning Outcomes using Problem Based Learning Assisted by Student Worksheets in Biology Learning" <em>BIOEDUKASI</em> [Online], Volume 21 Number 2 (25 June 2023)